Hello! Here is a small topology description: FaxA -- ClientA -- (internet) -- myFS -- ClientB -- FaxB ClientA - somewhere in the world, with unknow equipment myFS - FreeSWITCH Version 1.0.head (git-1c95ad9 2011-01-20 22-43-50 -0300) managed by me. As I need to process DTMF from clients, proxy_media=false ClientB - any of my clients with some type of equipment Voip<->FXS conversion FaxA/B - Faxes May someone tell me please what configuration should I do to permit my clients send and receive faxes? The main problem is that I really don't know when and on what number the user want to use fax machine. I have read mod_spandsp wiki but it isn't so clear. Is this enough to add this applications before any bridge?: <action application="set" data="fax_enable_t38=true"/> <!-- Enable t.38 for this call --> <action application="set" data="fax_enable_t38_request=true"/> <!-- Enable t38_gateway to send a t.38 reinvite when a fax tone is detected. If using t38_gateway peer then you need to export this variable instead of set --> <action application="set" data="execute_on_answer=t38_gateway self"/> <!--Execute t38_gateway on answer. self or peer. self: send a reinvite back to the a-leg. peer reinvite forward to the b-leg --> -- С уважением, Борис Коваленко ЗАО "Тагнет" (3435) 494991